Ground balance add on board for Mini pulse .

[godigit1]

Your welcome and Im glad your working on this as well it totally helps to have someone to bounce ides off.

So Im obviously not a engineer either but have allot of fun with it any ways.
I may play with a new board but I think 4 layers would be in order to keep the same board size.
I only have the free dip trace so I will have to change board size totally copy Georges layout as much as possible trying not to mess up signal traces.

That should keep me busy!!

So here is what I was thinking for the switch.
If we tie The 0 v in at a single location it will shut down the whole circut.
Maybe a couple diodes at the transistors but that might slow things down too much???
Hopefully someone with engineering knowledge can help answer that one for me .
Pretty Please

[geoscash1]

Your welcome and Im glad your working on this as well it totally helps to have someone to bounce ides off.

So Im obviously not a engineer either but have allot of fun with it any ways.
I may play with a new board but I think 4 layers would be in order to keep the same board size.
I only have the free dip trace so I will have to change board size totally copy Georges layout as much as possible trying not to mess up signal traces.

That should keep me busy!!

So here is what I was thinking for the switch.[ATTACH]44802[/ATTACH]
If we tie The 0 v in at a single location it will shut down the whole circut.
Maybe a couple diodes at the transistors but that might slow things down too much???
Hopefully someone with engineering knowledge can help answer that one for me .
Pretty Please

That looks like it will work perfect, it would kill all voltage to that side of the circuit.. My brain dont work as good as it use to, didnt even think of shutting off voltage to it like that.
I think youre right as far as diodes at the switches, that would change the timing if Im thinking correct..

Nice job...

Im probly not much help, just been feeling better so gettin back in to the swing of things...

It would be nice to hear from one of the gurus though, maybe just to help sort out these little details.

I dont think having the board a little bigger will matter to much. Even at 4×4 or a little longer one direction it will still be a decent size..

[Qiaozhi]

If you guys can do the hard graft of making an add-on board for the MPP Rev-E (a stripboard would be more than suitable) and prove that it works to your satisfaction, I'll volunteer to layout a new PCB. Then [hopefully] Silverdog will be able to offer kits for an MPP Rev-F version, and anyone else can get their own boards made up as well.
Too busy at the moment to really get involved, but I expect this could take you some time anyway to thrash it into shape.

[geoscash1]

If you guys can do the hard graft of making an add-on board for the MPP Rev-E (a stripboard would be more than suitable) and prove that it works to your satisfaction, I'll volunteer to layout a new PCB. Then [hopefully] Silverdog will be able to offer kits for an MPP Rev-F version, and anyone else can get their own boards made up as well.
Too busy at the moment to really get involved, but I expect this could take you some time anyway to thrash it into shape.

Hi George, thanks for offering that support..

I'm going to try to kludge something together on perf board and connect it to an mpp I have setup on my bench as a test board and see how it works out. According to Digger429 it sounds as if it seems to be working with the way he set it up so will try to get this together over the next days and see if it will be useable. The ground here in nor cal is pretty hot and littered with hot rock as well so it is something definitely needed. Hopefully this can be something that will help even with some depth loss or sensitivity loss.

I have been working on the other primary project so been spending time on it with a couple new coils I made for it.. working good too just as is...

[godigit1]

Thanks Guys.

I doubt Ill be able to get anything together that fast.
I decided to take the bare minimums to SC with me so Ill at least be able to follow along and catch up quickly I hope.
Ill try to get the rest of my board popuated and fired up see if it even works.
I designed it for rev E but have populated it for rev d so at least Ill be on the same page.
When I get it working I will still put together a piggy back pcb specifically for rev D and E so anyone can add it to their previous Pcbs.
Thanks again for all the help on this.

[geoscash1]

Well, this is my first try at using a pcb software so it aint pretty and by no means perfect but I think I got it. This is just the 3d pcb of the circuit from Digger429 along with what he described as the changes he was making. look it over and let me know if it you find errors or if it looks good to try out. it is just made as an add on board for now.

[godigit1]

Hi Geoscash,
Thanks for doing this .
I took a quick look at it looks like you got it all. I just see one thing , on the signal input pin 5 u1 would be from B on the schem, Is that going ot a switch or pot there?
Looks like maybe just a row of input pins and or testpoints.
Looking at your board i found a couple extra traces on mine.
Good lock with your pcb thats one of the fun parts for me . Looking forward to your results your moving right allong with this.
Thanks again.

[geoscash1]

Hi Geoscash,
Thanks for doing this .
I took a quick look at it looks like you got it all. I just see one thing , on the signal input pin 5 u1 would be from B on the schem, Is that going ot a switch or pot there?
Looks like maybe just a row of input pins and or testpoints. .

Those 3 pads are, from left to right are:
In from tp7 (pin 4 u7A on primary board)
Out to C (addon transistor j113)
Out to D (addon transistor j113)

I just wanted to put them all as close together as I could to make wiring it easier. Hope thats correct. The way Im reading it, you would take your signal wire from tp7 (u7A pin4 on main mpp schematic) to pin 5 of the GB addon board which in my other mockup I labeled u8. I should have put "from tp7" instead of pin 4 maybe.

[godigit1]

Ok my bad I didnt see your 3d view I was looking a the circuit trace pattern on the gerbers you sent. I should have pulled all the layers.
Looks good to me much more organized than mine was I was just trying to get as many traces without jumpers as I could.
Figured I would make another after working out the bugs.
Thanks again

[geoscash1]

Only thing I cant figure out is how to do the pcb image/file? where do you make that pcb file image or so you can use it to make one on a printer?

[godigit1]

Pick your bottom layer on the tool bar its bottom right youll see it. You can panelize it if you want to make more than one.
Then go to file .
Go to preview right above the print command .
Check your scale
You can also change layers on the preview screen.
Hope that helps

[godigit1]

Also you can mirror image on the preview screen.
Thats how I iron on the legend after you etch.

[geoscash1]

Also you can mirror image on the preview screen.
Thats how I iron on the legend after you etch.

Thank you godigit, much appreciated.. Got it figured out now so just printed off a copy to etch a board.. size didnt turn out to bad, 1.95x3.05 ... Now just hoping it works....lol

[Tibuck19]

Only thing I cant figure out is how to do the pcb image/file? where do you make that pcb file image or so you can use it to make one on a printer?

What pcb software you using ? I export with Eagle using the cam processor, then and use flatcam to open the Gbr files and export to a SVG file, it keeps all the Zeroing in tacked. If that helps any.

[geoscash1]

What pcb software you using ? I export with Eagle using the cam processor, then and use flatcam to open the Gbr files and export to a SVG file, it keeps all the Zeroing in tacked. If that helps any.

Thanks Tibuck19.. Im using diptrace, my first try so figuring out all the tool bars and stuff. Pretty neat little software..

Also, just caught 2 errors, I missed two 100n caps, between pins 1 & 16 on both uc's so I'll correct them tomorrow.